PSI - Issue 64

Maher AL-Hawarneh et al. / Procedia Structural Integrity 64 (2024) 1103–1110 Maher / Structural Integrity Procedia 00 (2019) 000 – 000

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Table 4: Summary of the FRCM effect on the compressive strength of the 55 MPa concrete specimens

Peak compressive strength

55 MPa

Strength gain (MPa)

Strength gain (%)

Specimen

55-0#1 55-0#2

- - -

- - -

53.2 56.5 54.9 57.9 62.8 60.4 69.6 62.7 66.2 68.3 61.0 73.5 67.6

Control

Avg

55-1-B#1 55-1-B#2

3.1 7.9 5.5

5.6

Bi-directional (1 layer)

14.5 10.1 26.8 14.4 20.6 24.6 11.2 34.0 23.2

Avg

55-1-U#1 55-1-U#3

14.7

Uni-directional (1 layer)

7.9

Avg

11.3 13.5

55-2-U#1 55-2-U#2 55-2-U#3

Uni-directional (2 layers)

6.1

18.7 12.7

Avg

4. Conclusion In general, concrete specimens confined with FRCM showed a better performance than the control (unconfined) specimens in terms of strength and maximum strain at failure. However, the effect of FRCM confinement was lower than anticipated in terms of the maximum strain achieved which could be attributed to the way the FRCM layers were applied. The concrete strength of FRCM confined specimens compared to the unconfined specimens in terms of absolute value was greater for the high concrete compressive strength compared to the 30 MPa concrete strength. However, both concrete strengths showed similar gains (in percentage) relative to the unconfined concrete specimens. The uni-directional FRCM specimens showed higher strength gain and achieved higher maximum strain compared with the bi-directional FRCM specimens for both concrete compressive strengths. This is attributed to the higher fibre density in the uni-directional fibre mesh compared to the bi-directional mesh . In addition, the 1-layer FRCM had similar confinement effect as the 2-layer FRCM for both concrete compressive strengths. This could be attributed to the way the second FRCM layer was applied. References Adheem, A.H., Kadhim, M.M., Jawdhari, A. and Fam, A., 2021. Confinement model for concrete wrapped with fiber reinforced cementitious mortar. Construction and Building Materials , 312 , p.125401. Arboleda, D., Carozzi, F.G., Nanni, A. and Poggi, C., 2016. Testing procedures for the uniaxial tensile characterization of fabric-reinforced cementitious matrix composites. Journal of Composites for Construction , 20 (3), p.04015063. Awani, O., El Refai, A. and El-Maaddawy, T., 2015. Bond characteristics of carbon fabric-reinforced cementitious matrix in double shear tests. Construction and Building Materials , 101 , pp.39-49. Bencardino, F., Carloni, C., Condello, A., Focacci, F., Napoli, A. and Realfonzo, R., 2018. Flexural behaviour of RC members strengthened with FRCM: State-of-the-art and predictive formulas. Composites Part B: Engineering , 148 , pp.132-148. CSA A23.1/A23.2. (2019) Concrete materials and methods of concrete construction / Methods of test and standard practices for concrete. Canadian Standards Association (CSA) Standard A23.1-14/A23.2-19 . Mississuaga, Ontario. D’Ambrisi, A. and Focacci, F., 2011. Flexural strengthening of RC beams with cement -based composites. Journal of Composites for Construction , 15 (5), pp.707-720. Elsanadedy, H.M., Almusallam, T.H., Alsayed, S.H. and Al-Salloum, Y.A., 2013. Flexural strengthening of RC beams using textile reinforced mortar – Experimental and numerical study. Composite Structures , 97 , pp.40-55. Faleschini, F., Zanini, M.A., Hofer, L. and Pellegrino, C., 2020. Experimental behaviour of reinforced concrete columns confined with carbon FRCM composites. Construction and Building Materials , 243 , p.118296. Faleschini, F., Zanini, M.A., Hofer, L., Toska, K., De Domenico, D. and Pellegrino, C., 2020. Confinement of reinforced concrete columns with glass fibre reinforced cementitious matrix jackets. Engineering Structures , 218 , p.110847. ICRI. (2013). Selecting and Specifying Concrete Surface Preparation for Sealers, Coatings, and Polymer Overlays . Internation Concrete Repair Institute (ICRI) Guideline 310.2R-2013 . Rosemont, Illinois Loreto, G., Leardini, L., Arboleda, D. and Nanni, A., 2014. Performance of RC slab-type elements strengthened with fabric-reinforced